support/support_capture_subprocess_check.c

   1 /* Verify capture output from a subprocess.
   2    Copyright (C) 2017-2020 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdbool.h>
  20 #include <stdio.h>
  21 #include <support/capture_subprocess.h>
  22 #include <support/check.h>
  23 #include <sys/wait.h>
  24
  25 static void
  26 print_context (const char *context, bool *failed)
  27 {
  28   if (*failed)
  29     /* Do not duplicate message.  */
  30     return;
  31   support_record_failure ();
  32   printf ("error: subprocess failed: %s\n", context);
  33 }
  34
  35 static void
  36 print_actual_status (struct support_capture_subprocess *proc)
  37 {
  38   if (WIFEXITED (proc->status))
  39     printf ("error:   actual exit status: %d [0x%x]\n",
  40             WEXITSTATUS (proc->status), proc->status);
  41   else if (WIFSIGNALED (proc->status))
  42     printf ("error:   actual termination signal: %d [0x%x]\n",
  43             WTERMSIG (proc->status), proc->status);
  44   else
  45     printf ("error:   actual undecoded exit status: [0x%x]\n", proc->status);
  46 }
  47
  48 void
  49 support_capture_subprocess_check (struct support_capture_subprocess *proc,
  50                                   const char *context, int status_or_signal,
  51                                   int allowed)
  52 {
  53   TEST_VERIFY ((allowed & sc_allow_none)
  54                || (allowed & sc_allow_stdout)
  55                || (allowed & sc_allow_stderr));
  56   TEST_VERIFY (!((allowed & sc_allow_none)
  57                  && ((allowed & sc_allow_stdout)
  58                      || (allowed & sc_allow_stderr))));
  59
  60   bool failed = false;
  61   if (status_or_signal >= 0)
  62     {
  63       /* Expect regular termination.  */
  64       if (!(WIFEXITED (proc->status)
  65             && WEXITSTATUS (proc->status) == status_or_signal))
  66         {
  67           print_context (context, &failed);
  68           printf ("error:   expected exit status: %d\n", status_or_signal);
  69           print_actual_status (proc);
  70         }
  71     }
  72   else
  73     {
  74       /* status_or_signal < 0.  Expect termination by signal.  */
  75       if (!(WIFSIGNALED (proc->status)
  76             && WTERMSIG (proc->status) == -status_or_signal))
  77         {
  78           print_context (context, &failed);
  79           printf ("error:   expected termination signal: %d\n",
  80                   -status_or_signal);
  81           print_actual_status (proc);
  82         }
  83     }
  84   if (!(allowed & sc_allow_stdout) && proc->out.length != 0)
  85     {
  86       print_context (context, &failed);
  87       printf ("error:   unexpected output from subprocess\n");
  88       fwrite (proc->out.buffer, proc->out.length, 1, stdout);
  89       puts ("\n");
  90     }
  91   if (!(allowed & sc_allow_stderr) && proc->err.length != 0)
  92     {
  93       print_context (context, &failed);
  94       printf ("error:   unexpected error output from subprocess\n");
  95       fwrite (proc->err.buffer, proc->err.length, 1, stdout);
  96       puts ("\n");
  97     }
  98 }